铁路营业线施工必须把确保（）放在首位，
A.行车安全
B.施工安全
C.质量
D.工期
参考答案：A
共鸣火花电疗法属于（）。
A.长波电流
B.中波电流
C.短波电流
D.微波电流
E.超短波电流
The questions on this part of the form only _____ married man. [ ]
A. appeal to
B. apply to
C. refer to
D. stick to
